Abstract
The structure of superconducting La 3Ni 2B 2N 3− x has been investigated by neutron powder diffraction methods at room temperature. The compound crystallizes with the symmetry of space group I4/mmm (No. 139) and lattice parameters a = 3.72512(5) and c = 20.5172(4)Å. The structure is layered and is made of (LaN) (LaN) (LaN) blocks with the rock-salt configuration alternating along the c-axis with Ni 2B 2 blocks having a fluorite-type arrangement of the atoms. The nitrogen site located on the central layer of the rock-salt block is only 90% occupied, yielding stoichiometry La 3Ni 2B 2N 2.9. Layers are connected to each other along the c-axis by La N, B N and Ni B bonds, while the connections within the layers are provided by La N and Ni Ni bonds.
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